These well designed, original fact and fiction books for older children are packed with illustrations, puzzles, stories, and activity features, and cover a variety of popular and educational topics. Each has a fold-out page of reusable stickers and detachable picture cards.Boys and girls are transported to Africa's Rift Valley, the source of many fossils of the earliest known humans and proto-humans. The theory of evolution is outlined in easy-to-understand language.